M
Manfred Ramsteiner
Researcher at Leibniz Institute for Neurobiology
Publications - 132
Citations - 4625
Manfred Ramsteiner is an academic researcher from Leibniz Institute for Neurobiology. The author has contributed to research in topics: Molecular beam epitaxy & Raman spectroscopy. The author has an hindex of 32, co-authored 123 publications receiving 4240 citations.
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Journal ArticleDOI
Nitride semiconductors free of electrostatic fields for efficient white light-emitting diodes
Patrick Waltereit,Oliver Brandt,Achim Trampert,Holger T. Grahn,J. Menniger,Manfred Ramsteiner,M. Reiche,Klaus H. Ploog +7 more
TL;DR: It is demonstrated that the epitaxial growth of GaN/(Al,Ga)N on tetragonal LiAlO2 in a non-polar direction allows the fabrication of structures free of electrostatic fields, resulting in an improved quantum efficiency, which is expected to pave the way towards highly efficient white LEDs.
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Luminescence of GaAs nanowires consisting of wurtzite and zinc-blende segments
Uwe Jahn,Jonas Lähnemann,Carsten Pfüller,Oliver Brandt,Steffen Breuer,Bernd Jenichen,Manfred Ramsteiner,Lutz Geelhaar,Henning Riechert +8 more
TL;DR: In this paper, a lower bound of 55 meV for the difference between the band gap energy of GaAs and wurtzite GaAs was derived from cathodoluminescence measurements of single GaAs nanowires.
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Coaxial multishell (In,Ga)As/GaAs nanowires for near-infrared emission on Si substrates.
Emmanouil Dimakis,Uwe Jahn,Manfred Ramsteiner,Abbes Tahraoui,Javier Grandal,Xiang Kong,Oliver Marquardt,Achim Trampert,Henning Riechert,Lutz Geelhaar +9 more
TL;DR: GaAs-based nanowires are used as building blocks for the emission of light with micrometer wavelength that are monolithically integrated on Si substrates to demonstrate the great potential of this technology.
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Formation of high-quality quasi-free-standing bilayer graphene on SiC(0 0 0 1) by oxygen intercalation upon annealing in air
M. H. Oliveira,Timo Schumann,Felix Fromm,Roland J. Koch,Markus Ostler,Manfred Ramsteiner,Thomas Seyller,Joao Marcelo J. Lopes,Henning Riechert +8 more
TL;DR: In this article, an annealing step in air is performed to convert epitaxial monolayer graphene on SiC(0 0 0 1) into decoupled bilayer graphene by performing Raman scattering and photoemission experiments.
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Uniform quantum-dot arrays formed by natural self-faceting on patterned substrates
R Richard Nötzel,Zhichuan Niu,Manfred Ramsteiner,Hans-Peter Schönherr,Achim Tranpert,Lutz Däweritz,Klaus H. Ploog +6 more
TL;DR: In this article, the photoluminescence spectrum of the resulting ordered arrays of quantum dots is dominated by a single sharp line, rather than the series of sharp lines that would indicate transitions in quantum dots of different sizes.